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Mr. Deb comes to Chinsurah station from his office by train regularly at a certain time. His private car reaches the station at the same time and picks him up to his residence. One day Mr. Deb reaches Chinsurah Station one hour earlier and started walking towards his residence without waiting for the car, with the intention to save some extra time to reach home a few minutes earlier than usual. Somewhere in the middle of the road his driver, who maintained his perfect timing, picks him up and reaches home five minutes earlier than the usual time. How long Mr. Deb walked before boarding his car?
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